Glass Bodies a variant-level encyclopedia of vintage lenses and cameras by iwillpat

Bronica SQ-Ai

Zenza Bronica · Bronica SQ mount · 55.6 × 55.6mm on 120 or 220 (Tamron JP specification); 6×4.5 with the SQ-i 120J and 220J backs, 24 × 36mm with the 135N and 24 × 54mm with the 135W back; Polaroid pack film with the CB102/CB103 backs (camera-wiki) · 1990

Also known as: Bronica SQ-Ai · Bronica SQAi · Bronica SQ-AI · Bronica SQ Ai · Zenza Bronica SQ-Ai · Zenzabronica SQ-Ai · Bronica SQ-Ai 6x6 · ゼンザブロニカ SQ-Ai · ゼンザブロニカSQ-Ai · ブロニカ SQ-Ai · ブロニカSQ-Ai · ブロニカ SQAi

Variants & identification

Variant Mount Years Serial ranges Production
SQ-Ai (1990–2003) Bronica SQ 1990–2003 — No production total is known to have been published. Tamron announced in October 2003 that production of the SQ-Ai, its lenses and accessories had ended at the end of September 2003, with sales continuing until stock ran out.
SQ-Ai 1998 Special Edition Bronica SQ 1998–1998 — 200 units, October 1998 (Japanese Wikipedia)
  1. No launch price for 1990 was found; the US list prices are from 1996 and 2004 and the yen set prices from Tamron's final price list of about 2001–03.
  2. Dimensions and weight are Tamron's figures for the standard set; no body-only figure is given.
  3. Tamron's specification lists the power as four 1.5 V LR44 cells; camera-wiki's table says SR44 while its text says LR44, and Japanese Wikipedia writes 4LR44, the single 6 V package of the same four cells.
  4. The 0.8s per frame for the Motor Drive SQ-i is from Tamron's US product page of 2004.
How to tell them apart (expand)
  • ZENZA BRONICA SQ-Ai on the front plate; shutter dial with 16s and B (Tamron JP)
  • SCA connector on the shutter-dial side; four-cell LR44 holder (camera-wiki; Tamron JP)
  • SQ-i backs carry the ISO dial and a ±2 EV compensation dial; the 1998 Special Edition is covered in brown leather (camera-wiki; Japanese Wikipedia)

SQ-Ai (1990–2003):

  • SQ-Ai on the front plate; shutter dial running 16s–1/500 with T and B (Tamron JP)
  • SCA flash connector on the shutter-dial side of the body for the SCA 386 adapter (camera-wiki)
  • Battery holder for four LR44 cells instead of the single 6 V cell of the SQ, SQ-A and SQ-B (Tamron JP; camera-wiki)
  • Motor Drive SQ-i coupling on the body; the crank for the SQ-Ai is a different part from the SQ/SQ-A/SQ-B crank (camera-wiki)

SQ-Ai 1998 Special Edition:

  • Brown leather covering in place of the black (Japanese Wikipedia)

Specifications

Format
55.6 × 55.6mm on 120 or 220 (Tamron JP specification); 6×4.5 with the SQ-i 120J and 220J backs, 24 × 36mm with the 135N and 24 × 54mm with the 135W back; Polaroid pack film with the CB102/CB103 backs (camera-wiki) · 12 on 120, 24 on 220 (Tamron JP) exposures
Finder (waist-level finder)
WL Finder S folding hood, supplied in the standard set (Tamron JP)
Finder (AE Prism Finder SQ-i)
eye-level prism with aperture-priority AE, in the AE sets (Tamron JP)
Finder (ME and MF finders)
metered prism and chimney finders from the SQ-A, manual exposure (camera-wiki)
Shutter
Seiko #0 electronically controlled leaf shutter in each lens; mechanical fallback at about 1/500 (Tamron JP) · 16s–1/500 in whole steps, T and B; no intermediate speeds (Tamron JP); 16s and B drain the battery while open and are unavailable with the ME and MF finders (camera-wiki) · flash sync X contact at all speeds; TTL-OTF automatic flash through the SCA 386 adapter on the body's SCA connector (Tamron JP; camera-wiki)
Film advance
Crank, one full turn, with small-increment winding; Motor Drive SQ-i detachable, about 0.8s per frame (Tamron JP; Tamron US)
Back
SQ-i backs with the ISO dial and an exposure-compensation dial of ±2 EV in 1/3 steps on the back; 120, 220, 120J and 220J (6×4.5), 135N and 135W; earlier SQ backs also fit (Tamron JP; camera-wiki)
Meter
None in the body beyond the TTL-OTF flash sensor; ambient metering in the AE Prism Finder SQ-i and the ME/MF finders; film speed to ISO 6400 (camera-wiki)
Motor drive
Motor Drive SQ-i — Made for the SQ-Ai and does not work properly on the other SQ bodies (camera-wiki)
Weight
1515 g
Dimensions
92 × 109 × 179 (W × H × D) and 1,515g with the PS 80mm, SQ-i 120 back and WL Finder S (Tamron JP) mm
Country
Japan
Original price
Body $1,465 on Tamron's April 1996 US list and $1,661 on its 2004 US list (archived Tamron US pages). In Japan, Tamron's late list gives the standard set of body, SQ-i 120 back, PS 80mm f/2.8 and WL Finder S at ¥261,000 (¥274,050 with tax), the AE set with AE Prism Finder SQ-i and Speed Grip S at ¥351,000, and the AE set with Motor Drive SQ-i at ¥383,000 (today $2,930)
Accessories
AE Prism Finder SQ-i (AE-i prism), plain prism, ME Prism Finder S, MF Finder S, WL Finder S (Tamron JP; camera-wiki) · SQ-i backs 120, 220, 120J, 220J, 135N, 135W; Polaroid backs CB102 and CB103; Polaroid tripod adapter (camera-wiki) · Motor Drive SQ-i and Remote Cord SQ-i; Speed Grip S; the SQ-Ai crank; Battery Pack SQ-Ai (4×LR44); cold battery packs (camera-wiki) · SCA 386 flash adapter for TTL-OTF flash (camera-wiki) · Teleconverters PS 1.4× (370g) and PS 2× (600g); extension tubes 18 and 36; auto bellows; bellows lens hood; close-up lenses 1 and 2 (Tamron JP; camera-wiki)

Finder display: flash-ready, battery check, shutter-closed signal, multiple-exposure warning and release-disabled (Tamron JP).

camera-wiki lists the AE-i prism as the finder that supports the 16s and B settings; the older ME and MF metered finders mount but those two settings do not work with them.

Where sources disagree

First
  • December 1990, Japanese release — Tamron's Bronica chronology and Japanese Wikipedia
  • Early 1991, US availability after the Photokina 1990 announcement — camera-wiki

Better supported: December 1990

Battery
  • Four 1.5 V alkaline LR44 — Tamron JP specification; camera-wiki text
  • SR44 — camera-wiki's comparison table
  • 4LR44 — Japanese Wikipedia

Better supported: Four LR44 in a holder

What reviewers say

History

The SQ-Ai was announced at Photokina in September 1990 and reached Japanese shops in December, the United States early in 1991 (Tamron chronology; camera-wiki). It kept the SQ-A’s body, mirror lock-up and crank and changed the electronics: TTL-OTF flash metering through an SCA connector and the SCA 386 adapter, a shutter range stretched to 16 s with a B setting beside the old T, a coupling for the detachable Motor Drive SQ-i, four LR44 cells in a holder instead of one 6 V cell, and new SQ-i backs that put the ISO dial and a ±2 EV compensation dial on the back itself, where a prism does not hide them (Tamron JP; camera-wiki). The new backs included 120J and 220J inserts for 6×4.5 and a 135W back for 24 × 54 mm panoramas. The 16 s and B settings work with the AE Prism Finder SQ-i but not with the older ME and MF metered finders, and both hold the shutter open on battery power, which is why the lens T setting remains the long-exposure tool (camera-wiki; Emulsive).

Tamron’s final price list gives the standard set of body, SQ-i 120 back, Zenzanon-PS 80mm f/2.8 and WL Finder S at ¥261,000 and 1,515 g, the AE set with prism and Speed Grip at ¥351,000, and the AE set with the motor drive at ¥383,000. In the United States the body alone was $1,465 on the April 1996 list and $1,661 in 2004. A Special Edition of 200 bodies in brown leather appeared in October 1998 (Japanese Wikipedia). Tamron, which owned Bronica from 1998, announced in October 2003 that production of the SQ-Ai with its lenses and accessories had ended at the close of September, closing the SQ line after 23 years; sales continued until stock ran out.

The one substantial review found is Adrian Vila’s on Emulsive, written after six months and more than a hundred rolls of landscape work. He bought the whole system for under $1,000 and calls it his favourite camera: a bright finder, sharp PS lenses, flash sync at any speed and a modularity he compares to Lego, with the T setting on the lens good for a three-hour exposure without draining the cells. The objections are the ones every SQ owner makes: weight on a long walk, a very loud shutter, slow lenses, B mode eating batteries past a minute, no place to stow the dark slide, and a reliability he doubts beside a Hasselblad’s.

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This history is AI-written, from the sources listed at the foot of the page. Where the record is silent it says so rather than filling the gap — but no human wrote these sentences.

Live listings

Buying from Yahoo! Auctions outside Japan. It is a domestic marketplace: sellers ship within Japan, and most will not register an overseas buyer. A proxy service bids on your behalf, receives the item and forwards it, for a fee and a wait. Buyee, Jauce and ZenMarket each accept a Yahoo auction number directly. Listed alphabetically for information — none is recommended over another, and none of these is an affiliate link.

Listings updated 2026-11-02. Links go to the shop or marketplace that carries the item.

Related: Bronica ETRSi · Bronica SQ · Bronica SQ-A · Bronica SQ-Am · Bronica SQ-B

Lenses for this body: Zenzanon 40mm f/4 (SQ) · Zenzanon 50mm f/3.5 (SQ) · Zenzanon-PS Macro 110mm f/4 (SQ) · Zenzanon-PS Macro 110mm f/4.5 1:1 (SQ) · Zenzanon-PS 135mm f/4 (SQ) · Zenzanon-PS 150mm f/4 (SQ) · Zenzanon-PS 180mm f/4.5 (SQ) · Zenzanon-PS 200mm f/4.5 (SQ) · Zenzanon-PS 250mm f/5.6 (SQ) · Zenzanon-PS Fisheye 35mm f/3.5 (SQ) · Zenzanon-PS 50-100mm f/4-5.6 Aspherical (SQ) · Zenzanon-PS 500mm f/8 (SQ) · Zenzanon-PS 65mm f/4 (SQ) · Zenzanon-PS 80mm f/2.8 (SQ) · Zenzanon-S 105mm f/3.5 (SQ) · Zenzanon-S 150mm f/3.5 (SQ) · Zenzanon-S 200mm f/4.5 (SQ) · Zenzanon-S 250mm f/5.6 (SQ) · Zenzanon-S 500mm f/8 (SQ) · Zenzanon-S 80mm f/2.8 (SQ) · Zoom Zenzanon-S Variogon 140-280mm f/5.6 (SQ) · Zoom Zenzanon-S Variogon 75-150mm f/4.5 (SQ)

Sources (8)

Every page here is assembled from public sources, and the gaps are real ones. If you own this camera, know a serial number I'm missing, or can see where I have it wrong, tell me — corrections, serials and sample photos are all worth having.